lighttroupe/luz

#
# GuiListSelect is a select box with popup list
#
class GuiListSelect < GuiValue
    easy_accessor :no_value_text, :item_aspect_ratio, :width

    def initialize(object, method)
        super
        @no_value_text = 'none'
        @item_aspect_ratio = 1.6
    end

    def gui_tick
        super
        @current_value_renderer.gui_tick if @current_value_renderer
    end

    #
    # Render
    #
    def gui_render
        with_gui_object_properties {
            object = get_value
            if object
                @current_value_renderer = object.new_renderer if @current_value_renderer.nil? || @current_value_renderer.object != object
                @current_value_renderer.gui_render        # TODO: renderer not attached, better to attach at time of selection than this
            else
                gui_render_no_value
            end
        }
    end

    def gui_render_no_value
        @no_value_label ||= GuiLabel.new.set(:width => 6, :text_align => :center, :string => @no_value_text, :scale => 0.75, :opacity => 0.2)
        @no_value_label.gui_render
    end

    #
    # Mouse interaction
    #
    def click(pointer)
        if list.empty?
            $gui.positive_message "None! Create One"
        else
            create_popup_list(pointer)
        end
    end

    def scroll_up!(pointer)
        list_cached = list
        current_index = list_cached.index(get_value)
        next_index = current_index ? ((current_index - 1) % list_cached.size) : 0
        set_value(list_cached[next_index])
    end

    def scroll_down!(pointer)
        list_cached = list
        current_index = list_cached.index(get_value)
        next_index = current_index ? ((current_index + 1) % list_cached.size) : 0
        set_value(list_cached[next_index])
    end

private

    def create_popup_list(pointer)
        renderers = list
        popup = GuiListPopup.new(pointer).set(:offset_x => pointer.x, :offset_y => pointer.y, :scale_x => 0.0, :scale_y => 0.0, :item_aspect_ratio => item_aspect_ratio).
            set_objects(renderers).
            animate({:scale_x => 0.18, :scale_y => 0.6}, duration=0.15)
        popup.on_selected { |object|
            set_value(object)
        }
        add_to_root(popup)
    end
end